This topic is unfortunately very misleading.  If I bet 10 Bitcoins 100 times at 99% win odds, that would be 1,000 Bitcoins wagered.  The amount of Bitcoins wagered is a fine way to compare casinos, but using it as a stat compared to the rest of the economy is 100% wrong.  17% of Bitcoins wagered through Just-Dice in 20 Months is not accurate.